1.Please check whether your car has factory amplifier.If your car supports DSP or external amplifier like Harmon Kardon, the JOYING android head unit will do not have no sound if you installed it. But you can modify speakers wires to bypass those Amplifiers, and to connect JOYING radio speakers wires to the car speakers, so it will be OK.
2.Please check whether your original car radio has screen or NOT. If your car has original screen like this picture to show, you have to buy the extend BMW cable.
3.If your BMW original car CD has blue and white connector, you also have to buy the BMW extension harness.
Be sure you have removed all usb devices you have on the unit, eject the CD, go to Bluetooth section and disconnect all the devices.
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